Publications
The CEGIS publications page is our one-stop collection of all publications from CEGIS authors, past and present.
Filter by type, year, or search by phrase below.
Pubs by theme
Pubs by theme
Publications are also grouped by subject theme and can be found via our Science pages.
Filter Total Items: 172
An interface between the Agricultural Non-Point Source (AGNPS) pollution model and the ERDAS Imagine Geographic Information System (GIS) An interface between the Agricultural Non-Point Source (AGNPS) pollution model and the ERDAS Imagine Geographic Information System (GIS)
The U.S. Department of Agriculture developed the Agricultural Non-Point Source (AGNPS) pollution model. The AGNPS pollution model simulates the behavior of runoff, sediment, and nutrient transport from watersheds that have agriculture as their prime use. This model has been used extensively by scientists conducting hydrologic or water quality analyses using computer modeling in an...
Authors
Michael P. Finn, E. Lynn Usery, Douglas J. Scheidt, Gregory M. Jaromack, Timothy D. Krupinski
Carbon isotopes from fossil packrat pellets and elevational movements of Utah agave plants reveal the Younger Dryas cold period in Grand Canyon, Arizona Carbon isotopes from fossil packrat pellets and elevational movements of Utah agave plants reveal the Younger Dryas cold period in Grand Canyon, Arizona
Carbon isotopes in rodent fecal pellets were measured on packrat (Neotoma spp.) middens from the Grand Canyon, Arizona. The pellet samples reflect the abundance of cold-intolerant C4 and Crassulacean acid metabolism (CAM) plant species relative to the predominant C3 vegetation in the packrat diet. The temporal sequence of isotopic results suggests a temperature decline followed by a...
Authors
K.L. Cole, S.T. Arundel
User's Guide for the Decision Support System for Map Projections of Small Scale Data, Version 2.0 User's Guide for the Decision Support System for Map Projections of Small Scale Data, Version 2.0
No abstract available.
Authors
Michael P. Finn, Laura N. Woodard
Spatial data acquisition and integration Spatial data acquisition and integration
No abstract available.
Authors
J. Jensen, A. Saalfeld, F. Broome, D. Cowen, K. Price, D. Ramsey, L. Lapine, E. Lynn Usery
Introduction to the UCGIS research agenda Introduction to the UCGIS research agenda
No abstract available.
Authors
E. Lynn Usery, Robert B. McMaster
Postscript on the UCGIS and research Postscript on the UCGIS and research
No abstract available.
Authors
D. M. Mark, E. Lynn Usery, Robert B. McMaster
A research agenda for geographic information science A research agenda for geographic information science
No abstract available.
Authors
Robert B. McMaster, E. Lynn Usery
Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model
Researchers have been coupling geographic information systems (GIS) data handling and processing capability to watershed and waterquality models for many years. This capability is suited for the development of databases appropriate for water modeling. However, it is rare for GIS to provide direct inputs to the models. To demonstrate the logical procedure of coupling GIS for model...
Authors
E.L. Usery, M.P. Finn, Daniel J. Scheidt, S. Ruhl, T. Beard, M. Bearden
A decision support system for map projections of small scale data A decision support system for map projections of small scale data
The use of commercial geographic information system software to process large raster datasets of terrain elevation, population, land cover, vegetation, soils, temperature, and rainfall requires both projection from spherical coordinates to plane coordinate systems and transformation from one plane system to another. Decision support systems deliver information resulting in knowledge that...
Authors
Michael P. Finn, E. Lynn Usery, Stephan T. Posch, Jeong Chang Seong
Users Guide for the MapImage Reprojection Software Package Users Guide for the MapImage Reprojection Software Package
No abstract available.
Authors
Michael P. Finn, Stephan T. Posch
Methods to achieve accurate projection of regional and global raster databases Methods to achieve accurate projection of regional and global raster databases
Modeling regional and global activities of climatic and human-induced change requires accurate geographic data from which we can develop mathematical and statistical tabulations of attributes and properties of the environment. Many of these models depend on data formatted as raster cells or matrices of pixel values. Recently, it has been demonstrated that regional and global raster...
Authors
E. Lynn Usery, Jeong Chang Seong, Dan Steinwand
All equal-area map projections are created equal, but some are more equal than others All equal-area map projections are created equal, but some are more equal than others
High-resolution regional and global raster databases are currently being generated for a variety of environmental and scientific modeling applications. The projection of these data from geographic coordinates to a plane coordinate system is subject to significant areal error. Sources of error include users selecting an inappropriate projection or incorrect parameters for a given...
Authors
E. Lynn Usery, Jeong Chang Seong